A single cell in a cellular bulkhead was instrumented to observe its behavior. Vibrating wire gages were employed to measure horizontal strains in sheetpiling webs. These strains were converted to interlock force on sheet piles at three elevations. The deformed shape was detected with an inclinometer. Movements were observed using surveying methods. The phreatic line inside cell was noted. Difficulties with instrumentation are described. Each major construction event is related to interlock forces, deformed shapes for sheetpiling, and movements of the cell. The study showed the current method of analysis to be adequate for calculation of maximum interlock forces. The maximum average coefficient of lateral earth pressure, K, appropriate for interlock force analysis during cell filling, was shown to be about 0.45. The settlement of the cell was about 8 in. (200mm) at the end of construction. Maximum movement of the cell toward the river was about 9 in. (230mm). The phreatic line inside the cell corresponded to the elevation of the adjacent river. Vibratory probe compaction of the cell fill did not produce notably large interlock forces.